My bees had been very active all winter and into early spring. Suddenly in late April I noticed a marked decrease in activity. I checked the hive on May 2, 2021, and found a queen and a small amount of bees. There were no queen cells. The whole brood section was empty, but there were nine full frames of honey behind it. There was a family of mice in the back third, and it was moldy only back there, because I had neglected to put a ventilated inner cover in the back third.